243149 has 2 divisors, whose sum is σ = 243150. Its totient is φ = 243148.

The previous prime is 243137. The next prime is 243157. The reversal of 243149 is 941342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243049 + 100 = 493^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 243149 - 2¹² = 239053 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2⁷ + 4⁴ + 1 + 3¹¹ + 4⁸ + 9² .

It is equal to p₂₁₄₇₉ and since 243149 and 21479 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121574 + 121575.

It is an arithmetic number, because the mean of its divisors is an integer number (121575).

2²⁴³¹⁴⁹ is an apocalyptic number.

It is an amenable number.

243149 is a deficient number, since it is larger than the sum of its proper divisors (1).

243149 is an equidigital number, since it uses as much as digits as its factorization.

243149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 243149 is about 493.1014094484. The cubic root of 243149 is about 62.4152665090.

The spelling of 243149 in words is "two hundred forty-three thousand, one hundred forty-nine".